How to draw curve with arc?

[n-2204]

Hi All,
I'm sharing the code, Using this code drawing half circle(curve ) how to add arrow at the end of this curve ?
Or is there other way to draw curve with direction/arrow. but I'm drawing this curve inside the circle so i think using radius its better way.
CHPlotCurve--derived from QwtPlotCurve class
CHPlotGraph2D-2D Graph derived from QwtPlot

  for (int irows = 0, maxI = table1->rowCount(); irows < maxI; ++irows)
  {        
      double x1 = table1->data(table1->index(irows, 1)).toDouble(&ok1);
      double y1 = table1->data(table1->index(irows, 2)).toDouble(&ok2);
 QVector <double> ax,ay;
 for (double angle = 0; angle <= 3.2; angle += 0.00314)
          {
              double ax1 = x1 + (r / 2) * cos(angle);
              double ay1 = y1 + (r / 2) * sin(angle);
              ax.append(ax1);
              ay.append(ay1);
              CHPlotCurve* arc = (CHPlotCurve*)pGr->insertCurve("arc", CHPlotGraph2D::Line, false);
              arc->setSamples(ax, ay);
              arc->setPen(Qt::blue);           
          }

Thankyou. Your answers are welcome

[TheGringerEye]

@n-2204 https://www.w3schools.com/code/tryit.asp?filename=GRLN84LQBK8O if I understood correctly what you wanted, then rate it

[n-2204]

How to draw like this ?

[n-2204]

Can anyone suggest something? refer any examples/link

[mrjj]

@n-2204

Hi
Since you are using a QwtPlotCurve as base, i think you have to
override
https://qwt.sourceforge.io/class_qwt_plot_curve.html#a2307196a17121dc72c2c88a0c5a46dc7

and draw it your self.

I think not QWT offers this out of the box but its not an official Qt Module so I dont know it that well.

[TheGringerEye]

@n-2204 https://www.w3schools.com/code/tryit.asp?filename=GRLN84LQBK8O if I understood correctly what you wanted, then rate it